Mathc matrices/a40
Apparence
Installer et compiler ces fichiers dans votre répertoire de travail.
c00.c |
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/* ------------------------------------ */
/* Save as : c00.c */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
/* ------------------------------------ */
#define RA R2
#define CA C2
#define Cb C2
/* ------------------------------------ */
/* ------------------------------------ */
#define B (1.)
//#define B (3./4.)
/* ------------------------------------ */
/* ------------------------------------ */
int main(void)
{
/*
* Find a value for "B" so that the system is compatible.
*/
double ab[RA*(CA+Cb)]={
// A = x*B + y
-1, -9, -3*B, +1,
-1, -9, 1*B, -2};
double **Ab = ca_A_mR(ab,i_Abr_Ac_bc_mR(RA,CA,Cb));
double **A = c_Ab_A_mR(Ab,i_mR(RA,CA));
double **b = c_Ab_b_mR(Ab,i_mR(RA,Cb));
clrscrn();
printf(" A :");
p_mR(A,S3,P0,C7);
printf(" b :");
p_mR(b,S3,P0,C7);
printf(" Ab :");
p_mR(Ab,S3,P0,C7);
getchar();
clrscrn();
printf(" Copy/Past into the octave window.\n\n");
p_Octave_mR(Ab,"Ab",P0);
printf("\n rref(Ab,.00000000001)\n\n");
printf(" gj_PP_mR(Ab,YES) :");
gj_PP_mR(Ab,YES);
p_mR(Ab,S8,P4,C7);
stop();
f_mR(Ab);
f_mR(b);
f_mR(A);
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
Calculer la valeur de B pour que le système soit compatible. Exemple de sortie écran :
------------------------------------
A :
-1 -9
-1 -9
b :
-3 +1
+1 -2
Ab :
-1 -9 -3 +1
-1 -9 +1 -2
------------------------------------
Copy/Past into the octave window.
Ab=[
-1,-9,-3,+1;
-1,-9,+1,-2]
rref(Ab,.00000000001)
gj_PP_mR(Ab,YES) :
+1.0000 +9.0000 +3.0000 -1.0000
+0.0000 +0.0000 +4.0000 -3.0000
Press return to continue.
La dernière ligne donne :
+0.0000 +0.0000 +4.0000 -3.0000 ou bien +0.0000 = +4.0000 -3.0000 en introduisant B +0.0000 = +4.0000 B -3.0000 soit le système +4.0000 B = +3.0000 cela donne B 3./4.